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.. image:: https://camo.githubusercontent.com/dbf39cef1a973d8741437693e96b59e31d9e3754/68747470733a2f2f7777772e736861726b626974652e696f2f77702d636f6e74656e742f75706c6f6164732f323031372f30322f736861726b626974652e6a7067 | ||
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Async Example | ||
================== | ||
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Below is an example client based on pysharkbite. We'll step through important aspects followed by the entirety of the code | ||
at the end. | ||
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The first interesting piece of code that we come across is printasync, which is intended to asynchronously | ||
print the rows from all keys. This coroutine will be used later to loop through the asynchronous iterator. | ||
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.. code-block:: python | ||
async def printasync(iter): | ||
async for keyvalue in iter: | ||
key = keyvalue.getKey() | ||
print(key.getRow()) | ||
After writing data the example creates a scanner. This scanner creates a range from 'row' to 'row3' then | ||
creates an async event loop to call the coroutine printasync. As stated above this enables us to asynchronously | ||
print the rows. | ||
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.. code-block:: python | ||
scanner = table_operations.createScanner(auths, 2) | ||
range = pysharkbite.Range("row"",True,"row3"",False) | ||
scanner.addRange( range ) | ||
resultset = scanner.getResultSet() | ||
loop = asyncio.get_event_loop() | ||
loop.run_until_complete(printasync(resultset)) | ||
.. code-block:: python | ||
#!/usr/bin/python | ||
# Licensed to the Apache Software Foundation (ASF) under one | ||
# or more contributor license agreements. See the NOTICE file | ||
# distributed with this work for additional information | ||
# regarding copyright ownership. The ASF licenses this file | ||
# to you under the Apache License, Version 2.0 (the | ||
# "License"); you may not use this file except in compliance | ||
# with the License. You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, | ||
# software distributed under the License is distributed on an | ||
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
# KIND, either express or implied. See the License for the | ||
# specific language governing permissions and limitations | ||
# under the License. | ||
from ctypes import cdll | ||
from argparse import ArgumentParser | ||
from ctypes import cdll | ||
import ctypes | ||
import traceback | ||
import time | ||
import asyncio | ||
""" | ||
This is an Example of using the Python connectors. The example will accept user input | ||
create a table writing arbitrary information to it via the BatchWriter and scanner will put the written data | ||
""" | ||
parser = ArgumentParser(description="This is an Apache Accummulo Python connector") | ||
parser.add_argument("-i", "--instance", dest="instance", | ||
help="Apache Accumulo Instance Name", required=True) | ||
parser.add_argument("-z", "--zookeepers", dest="zookeepers", | ||
help="Comma Separated Zookeeper List", required=True) | ||
parser.add_argument("-u", "--username", dest="username", | ||
help="User to access Apache Accumulo", required=True) | ||
parser.add_argument("-p", "--password", dest="password", | ||
help="Password to access Apache Accumulo. May also be supplied at the command line") | ||
parser.add_argument("-t", "--table", dest="table", | ||
help="Table to create/update") | ||
args = parser.parse_args() | ||
password = args.password | ||
table = args.table | ||
async def printasync(iter): | ||
async for keyvalue in iter: | ||
key = keyvalue.getKey() | ||
print(key.getRow()) | ||
if not password: | ||
print("Please enter your password") | ||
password = input() | ||
if not table: | ||
table = "blahblahd" | ||
import pysharkbite | ||
configuration = pysharkbite.Configuration() | ||
zk = pysharkbite.ZookeeperInstance(args.instance, args.zookeepers, 1000, configuration) | ||
user = pysharkbite.AuthInfo(args.username, password, zk.getInstanceId()) | ||
try: | ||
connector = pysharkbite.AccumuloConnector(user, zk) | ||
table_operations = connector.tableOps(table) | ||
if not table_operations.exists(False): | ||
print ("Creating table " + table) | ||
table_operations.create(False) | ||
else: | ||
print (table + " already exists, so not creating it") | ||
auths = pysharkbite.Authorizations() | ||
""" Add authorizations """ | ||
""" mutation.put("cf","cq","cv",1569786960) """ | ||
writer = table_operations.createWriter(auths, 10) | ||
mutation = pysharkbite.Mutation("row2"); | ||
mutation.put("cf","cq","",1569786960, "value") | ||
mutation.put("cf2","cq2","",1569786960, "value2") | ||
""" no value """ | ||
mutation.put("cf3","cq3","",1569786960, "") | ||
writer.addMutation( mutation ) | ||
writer.close() | ||
time.sleep(2) | ||
""" auths.addAuthorization("cv") """ | ||
scanner = table_operations.createScanner(auths, 2) | ||
range = pysharkbite.Range("row"",True,"row3"",False) | ||
scanner.addRange( range ) | ||
resultset = scanner.getResultSet() | ||
loop = asyncio.get_event_loop() | ||
loop.run_until_complete(printasync(resultset)) | ||
""" delete your table if user did not create temp """ | ||
if not args.table: | ||
table_operations.remove() | ||
except RuntimeError as e: | ||
traceback.print_exc() | ||
print("Oops, error caused: " + str(e)) |
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.. image:: https://camo.githubusercontent.com/dbf39cef1a973d8741437693e96b59e31d9e3754/68747470733a2f2f7777772e736861726b626974652e696f2f77702d636f6e74656e742f75706c6f6164732f323031372f30322f736861726b626974652e6a7067 | ||
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HDFS Client | ||
================== | ||
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The `hdfs client <https://docs.sharkbite.io/en/latest/sharkbitedocs.html#pysharkbite.Hdfs>`_ is nearly full client. It lacks | ||
features found in the C++ client. These will be added over time. Please visit the link, above, to find the API of what is currently supported | ||
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An example usage of these functions is below. Note that if Opening RFiles in pysharkbite, you must specify the full path including | ||
the hdfs protocol if it is located on HDFS. This will open a full HDFS client to access these files. | ||
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.. code-block:: python | ||
import pysharkbite | ||
hdfs = pysharkbite.Hdfs("hdfs://namenode:8020",8020); | ||
hdfs.mkdir("/directoryA/directoryB"); | ||
hdfs.list("/"); |
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